An illustration of Sherlock Holmes and Dr. Watson that appeared in a stamp printed in Alderney, circa 2009. Photo: Olga Popova/Shutterstock.com

The Ardlamont murder was an open and shut case. A young, wealthy aristocrat, Cecil Hambrough, was out hunting on the Ardlamont estate in Scotland with two associates—Alfred Monson, his tutor, and a mysterious third man named Edward Scott, who was identified only as a friend of Monson—when shots were heard. Estate workers saw Monson and Scott running out of the woods carrying guns. They were cleaning the weapons when the estate butler asked what had become of Mr. Hambrough. Monson replied that he had shot himself in the head by accident while climbing a fence. At first, the death appeared to be a tragic accident. But two weeks later it was discovered that Hambrough had taken out two life insurance policies only six days before he died. The nominees for both were Monson’s wife.